【java】如何在IDEA 中查看 Class文件的汇编

x33g5p2x  于2022-02-19 转载在 Java  
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1.概述

转载:面经手册 · 第14篇《volatile 怎么实现的内存可见?没有 volatile 一定不可见吗?》

通过Class文件查看汇编,需要下载 hsdis-amd64.dll 文件,复制到 JAVA_HOME\jre\bin\server目录下。下载资源如下:

http://vorboss.dl.sourceforge.net/project/fcml/fcml-1.1.1/hsdis-1.1.1-win32-amd64.zip(opens new window)

http://vorboss.dl.sourceforge.net/project/fcml/fcml-1.1.1/hsdis-1.1.1-win32-i386.zip

另外是执行命令,包括:

基础指令:java -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly
指定打印:-XX:CompileCommand=dontinline,类名.方法名
指定打印:-XX:CompileCommand=compileonly,类名.方法名
输出位置:> xxx

最终使用:java -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly -XX:CompileCommand=dontinline,ApiTest.main -XX:CompileCommand=compileonly,ApiTest.mian

指令可以在IDEA中的 Terminal 里使用,也可以到 DOS黑窗口中使用

另外,为了更简单的使用,我们把指令可以配置到idea的 VM options 里,如下图:

配置完成后,不出意外的运行结果如下:

Loaded disassembler from C:\Program Files\Java\jdk1.8.0_161\jre\bin\server\hsdis-amd64.dll
Decoding compiled method 0x0000000003744990:
Code:
Argument 0 is unknown.RIP: 0x3744ae0 Code size: 0x00000110
[Disassembling for mach='amd64']
[Entry Point]
[Constants]
  # {method} {0x000000001c853d18} 'getSnapshotTransformerList' '()[Lsun/instrument/TransformerManager$TransformerInfo;' in 'sun/instrument/TransformerManager'
  #           [sp+0x40]  (sp of caller)
  0x0000000003744ae0: mov     r10d,dword ptr [rdx+8h]
  0x0000000003744ae4: shl     r10,3h
  0x0000000003744ae8: cmp     r10,rax
  0x0000000003744aeb: jne     3685f60h          ;   {runtime_call}
  0x0000000003744af1: nop     word ptr [rax+rax+0h]
  0x0000000003744afc: nop
[Verified Entry Point]
  0x0000000003744b00: mov     dword ptr [rsp+0ffffffffffffa000h],eax
  0x0000000003744b07: push    rbp
  0x0000000003744b08: sub     rsp,30h           ;*aload_0
                                                ; - sun.instrument.TransformerManager::getSnapshotTransformerList@0 (line 166)

  0x0000000003744b0c: mov     eax,dword ptr [rdx+10h]
  0x0000000003744b0f: shl     rax,3h            ;*getfield mTransformerList
                                                ; - sun.instrument.TransformerManager::getSnapshotTransformerList@1 (line 166)

  0x0000000003744b13: add     rsp,30h
...

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